aws-ecr-push-image does not tag images based on the image name

[Gabriel Bellon]

Hello, 

I'm using `atlassian/aws-ecr-push-image:1.4.1` to push an image to my ECR repository, after setting the image name with the pattern `image_name:tag` the result in my repository was an image with the `latest` tag thus not using the image name pattern.

Here is the part of my pipeline configuration that reflects this behaviour:

```
 - step: name: 'Build' 
   script: 
   - docker build -t super-test:${BITBUCKET_BRANCH}-${BITBUCKET_COMMIT} . 
   - pipe: atlassian/aws-ecr-push-image:1.4.1 
     variables: 
       AWS_ACCESS_KEY_ID: $AWS_ACCESS_KEY_ID 
       AWS_SECRET_ACCESS_KEY: $AWS_SECRET_ACCESS_KEY 
       AWS_DEFAULT_REGION: $AWS_DEFAULT_REGION 
       IMAGE_NAME: super-test:${BITBUCKET_BRANCH}-${BITBUCKET_COMMIT} 
       TAGS: '${BITBUCKET_BRANCH}-${BITBUCKET_COMMIT}'

 Just after setting the `TAGS` attribute, the correct image name with the desired pattern was created.

This is kinda misleading while reading the examples and documentation.

[Oleksandr Kyrdan]

Hi @Gabriel Bellon

Thank you for your question!

It's a good time to update pipe's Readme!

We'll update the pipe and notify you.

Cheers,
Oleksandr Kyrdan